tl;dr:
This patch adds a new ioctl to KVM on s390x for reading and writing from/to
virtual guest memory, to take account of the so-called IPTE-lock on s390x
(a locking mechanism for the host to walk MMU tables of the guest).
Long story:
Certain instruction interception handlers in QEMU have to
On 03/02/2015 13:11, Thomas Huth wrote:
The userspace (QEMU) then can simply call this ioctl when it wants
to read or write from/to virtual guest memory. Then kernel then takes
the IPTE-lock, walks the MMU table of the guest to find out the
physical address that corresponds to the virtual
Am 03.02.2015 um 13:59 schrieb Paolo Bonzini:
On 03/02/2015 13:11, Thomas Huth wrote:
The userspace (QEMU) then can simply call this ioctl when it wants
to read or write from/to virtual guest memory. Then kernel then takes
the IPTE-lock, walks the MMU table of the guest to find out the
